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Thanks Guys, I like this one !
I am quite happy with the image - I will try for 300s with NR on and compare to 300s with DF subtration in IP - have to take some care though as the moon state/temp/transparancy/seeing/alt of target etc etc all impact image quality BUT it imy impression the AMP glow is better handled by the in camera NR...of course you pay a big penalty - lose 1/2 your collection time but I guess the test is not how many lights you took but what the result looks like after a, say, 2 hr run...
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